如何在Spring Data JPA中编写动态的本机SQL查询? [英] How to write dynamic native SQL Query in spring data JPA?

问题描述

我需要在Spring Boot Web应用程序中的数据库中的多个表上编写搜索查询.

I need to write a search query on multiple tables in database in spring boot web application.

它使用spring数据jpa.我知道我们可以使用@Query批注和native = true标志在spring数据jpa中编写本机查询.

It uses spring data jpa. I know we can write native query in spring data jpa using @Query annotation and native = true flag.

有什么方法可以在存储库类中编写查询，而不是@Query注释，因为查询非常复杂且动态.

Is there any way I can write query in repository class and instead of the @Query annotation as the Query is very complex and dynamic.

推荐答案

您需要执行CustomRepository并添加带有本机查询的方法.

You need to do a CustomRepository and add a method with native query.

我这样做:

1. 创建您的自定义存储库:

1. Create your custom repository:

public interface OcorrenciaRepositoryCustom {
   List<Object[]> getStrings(List<String> valores);
}

实施您的自定义存储库: (实现的名称必须是原始存储库的名称，并以Impl作为后缀.)

Implement your custom repository: (The name of the implemantation must be the name of original repository add Impl as suffix.)

public class OcorrenciaRepositoryImpl implements OcorrenciaRepositoryCustom {
    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public List<Object[]> getStrings(List<String> strings) {
        StringBuilder sb = new StringBuilder();
        sb.append("SELECT count(o.id) FROM soebm.ocorrencia o WHERE 1=1 ");

        if(strings.get(0)!=null && StringUtils.isNotEmpty(strings.get(0))) {
            sb.append(" AND to_char(o.date, 'YYYY-MM-DD') >= :dataInicio ");
        }

        Query query = entityManager.createNativeQuery(sb.toString());

        if(strings.get(0)!=null && StringUtils.isNotEmpty(strings.get(0).toString())) {
            query.setParameter("dataInicio", strings.get(0));
        }
        return query.getResultList();
    }
}

从主存储库扩展您的自定义存储库:

Extend your custom repository from main repository:

public interface OcorrenciaRepository extends JpaRepository<Ocorrencia, Long>, OcorrenciaRepositoryCustom {
    Ocorrencia findByPosto(Posto posto);
}

现在，在服务中，您可以从主存储库调用新方法.

Now, in the service, you can call your new method from the main repository.

@Autowired
private OcorrenciaRepository repository;

public List<Object[]> findOcorrenciaCustom(String str) {
    List<String> strings = new ArrayList<String>() {{add(dataInicio);}};
    return repository.getStrings(strings);
}

自定义存储库位于JpaRepositories搜索的软件包下很重要

It is important that the custom repository is under the package searched by JpaRepositories

@EnableJpaRepositories("com.test.my.repository")

在此示例中，我使用了Spring-Data-Jpa 1.9.在我的项目中效果很好.

I used Spring-Data-Jpa 1.9 in this example. It worked perfectly in my project.

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